Sadly, when I was in relationships going out to eat got abused.
I'd get buffalo wings and beer, and the person next to me got Margheritas and swordfish. I paid that whole bill numerous times, then the other couple would pay another time. However, it would still work out that we only contributed 60$ to a 150$ bill, yet the other couple never had the brains to say "We'll throw in another 20$, you guys didn't eat much...." It started to PISS ME OFF!!
The next time I asked them to split it, the other couple looked at me like I was an A hole. WHATEVER............
But yes, plenty of waitresses don't "feel" like splitting up the bill which is actually dumb because each couple or individual may actually leave her a tip which ends up being a greater amount.
It's best to tell them from the very beginning to make life easier.
Believe me, I'm not cheap and I take good care of people I "like" but once that gets abused a few times, it stews with me and I explode which never turns out good
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country